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This OSF repo contains supplemental materials for an EHPS 2019 symposium. ### Abstract **Aims**: This symposium aims to improve intervention development, analysis, and reporting practices, benefiting both practitioners and researchers by presenting five innovative approaches to understanding and communicating intervention effectiveness. These approaches represent tools that can be used in practice but are based on fundamental behavior change research, thereby facilitating knowledge translation in behavior change settings. **Rationale**: Developing effective behavior change interventions to enhance health requires close cooperation between practitioners, behavior change professionals, and target population individuals. This close cooperation in turn requires a shared vocabulary, shared means of unequivocally expressing intervention content and development decisions, and tools consistent with insights from behavior change science. This symposium provides those. **Summary**: First, the novel Potential for Change index will be introduced, a tool to select (sub-)determinants to target in an intervention and to understand effectiveness patterns in intervention evaluations. Second, interventions are often compared to a control group that receives treatment-as-usual, and the resulting effectiveness is therefore also determined by the treatment-as-usual characteristics. A list of characteristics, potentially critical for comparing and interpreting trials with treatment-as-usual comparators, will be presented. One such characteristic is who delivers the intervention to participants. Therefore, third, an ontology of potential intervention sources is presented. Fourth, the Acyclic Behavior Change Diagram is introduced, a human- and machine-readable format for presenting both which (sub-)determinants an intervention targets and which behavior change principles are used. Fifth, an important but often neglected phase in intervention development is discussed: how to combine all the theoretically effective elements into an intervention in an evidence-based manner. As yet, the lack of systematic documentation of decisions in that stage hampers evidence accumulation, and the final contribution will discuss this and propose a solution. The symposium ends with a discussion of the tensions between theoretical and methodological necessities and feasibility constraints in intervention development.